Emergency cut-off valve for movable pressure vessel

Abstract

The invention discloses an emergency cut-off valve for a movable pressure container, and relates to the technical field of emergency cut-off valves. Comprising a valve body, a pressing rod is arranged at the upper end of the valve body, a hand wheel is arranged outside the pressing rod, the upper end of a ratchet wrench is connected with the ratchet wrench, a stop valve rod is installed in the valve body and is of a hollow structure, the pressing rod is in threaded connection with the stop valve rod, and a sealing gasket is arranged in the middle of the interior of the valve body. A sealing gasket is arranged in the valve body, a stop valve clack is arranged in the sealing gasket, a deflector rod shaft and an inner deflector rod are arranged on one side wall face in the valve body, a valve cover is installed at the bottom of the valve body, a compression spring is connected to the inner wall face of the valve cover, and the upper end of the compression spring is connected with the stop valve clack. When the emergency cut-off valve and an oil pressure system break down, the manual pressing rod is started to start a novel emergency cut-off mechanism, the manual pressure opening function of the emergency cut-off valve is achieved, and therefore the safety of the loading and unloading functions of the emergency cut-off valve is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of emergency shut-off valves, and particularly to an emergency shut-off valve for mobile pressure vessels. Background Art

[0002] Mobile pressure vessels are used on tank containers for road transportation, railway transportation, sea areas, and river transportation, and are specialized in transporting flammable, explosive, high-pressure and low-temperature, highly toxic chemical media. Their safety is of crucial importance. As a key safety device, the emergency shut-off valve can quickly cut off the outflow of the medium in case of sudden situations such as pipeline rupture, leakage, or fire, preventing the expansion of accidents.

[0003] Emergency shut-off valves are generally used for the transportation of flammable, explosive, low-temperature, highly toxic, and liquid substances on tank containers. In case of emergencies such as fire and explosion, the emergency shut-off valve automatically cuts off with its built-in hydraulic system the medium flow at the inlet and outlet of the tank container, thus cutting off the connection between the tank or pipeline and other parts, and playing a role in controlling or reducing the harm of accidents.

[0004] At present, the automatic cut-off types of special emergency shut-off valves for domestic and foreign hazardous chemical tank containers are divided into two types: one is to cut off the oil circuit and relieve pressure, and use the spring pressure to close the cut-off valve flap to cut off the inlet and outlet of the tank body and pipeline; the other is to set a safety flow value, and use the spring pressure to balance and seal the cut-off valve flap. When the flow rate is greater than the set flow value, the top force spring and the flow velocity are greater than the pressure spring force. At this time, under the combined action of the flow velocity pressure and the spring force, the cut-off valve flap closes to cut off the flow.

[0005] The inventor found the following problems in the prior art during the implementation of the present invention:

[0006] When a failure occurs where the cut-off valve flap is stuck with the valve stem during the loading and unloading of the medium in the tank container, the hydraulic system cannot open the valve flap at this time, and the medium in the tank cannot be unloaded, resulting in a unloading blockage accident, which further leads to the expansion of the accident. It can be seen that the emergency shut-off valve in the prior art needs to be further improved. Summary of the Invention

[0007] Aiming at the deficiencies of the prior art, the present invention provides an emergency shut-off valve for mobile pressure vessels, which solves the deficiencies of the prior art.

[0008] To achieve the above objectives, the present invention is realized through the following technical solutions: An emergency cut-off valve for a mobile pressure vessel, comprising a valve body. A pressure rod is provided at the upper end of the valve body, and a handwheel is provided outside the pressure rod. The upper end of the ratchet wrench is connected to a ratchet wrench. A stop valve rod is installed inside the valve body. The stop valve rod is of a hollow structure. The pressure rod is threadedly connected to the stop valve rod. A sealing gasket is provided in the middle of the valve body, and a stop valve flap is provided inside the sealing gasket. A lever shaft and an inner lever are provided on one side wall surface inside the valve body. A valve cover is installed at the bottom of the valve body. A compression spring is connected to the inner wall surface of the valve cover. The upper end of the compression spring is connected to a cut-off valve flap, and the upper end of the cut-off valve flap is connected to a cut-off valve rod.

[0009] Preferably, a pressure rod packing seal is provided between the handwheel and the pressure rod, and a stop valve rod packing seal is provided between the stop valve rod and the valve body.

[0010] Preferably, the upper end of the cut-off valve rod contacts the inner lever.

[0011] Operation steps description when manually opening the cut-off valve flap

[0012] Explanation: When the top force of the oil pressure cylinder cannot open the cut-off valve flap, it indicates that the cut-off valve flap and the cut-off valve rod are rusted and deformed and stuck, resulting in the cut-off valve flap not being able to open, causing a plugging removal accident. In this case, the manual pressure rod mechanism is activated.

[0013] The manual opening mechanism is arranged inside the stop valve rod. When the stop valve is normally opened and closed, the pressure rod is positioned on the explosion-proof sheet on the cut-off valve flap by threaded connection and moves synchronously with the valve flap.

[0014] Operation steps of the pressure rod;

[0015] Rotate the stop valve handwheel to the sealed state. Rotate the pressure rod handle until the top of the pressure rod presses down. Continue to apply force and rotate the pressure rod handle so that the pressure rod breaks through the sealing gasket and presses against the inner lever, and the inner lever presses against the cut-off valve rod. Thus, a rod linkage pressure mechanism with the stop valve rod as the base shaft is formed.

[0016] The operator only needs to rotate the ratchet wrench, and the four-bar linkage mechanism is opened under the top pressure of the screw thread. When the operator hears a burst sound of the flowing medium, the cut-off valve flap has been opened.

[0017] Beneficial effects

[0018] The present invention provides an emergency cut-off valve for a mobile pressure vessel. The present invention designs an opening mechanism for the emergency cut-off valve that combines hydraulic power and manual pressure power. The focus of the present invention is that when the tank container filled with hazardous chemical medium is unloaded and the oil pressure jacking system fails, the cut-off valve flap placed inside the tank body cannot be opened, triggering an unloading accident. At this time, the manual lever linkage mechanism with the stop valve stem as the base shaft is activated, and the lever handle is rotated to press open the cut-off valve flap with the rotational force of the thread until the medium is normally unloaded. This invention completely eliminates the potential accident hazard of the emergency cut-off valve being blocked during unloading. Thus, it effectively guarantees the safety of the loading and unloading system of the special emergency cut-off valve for the tank truck. The present invention realizes a new mechanism for manually pressing the lever to open the emergency cut-off when the oil pressure system of the emergency cut-off valve fails, and realizes the function of manually opening the emergency cut-off valve with pressure, thereby effectively guaranteeing the safety of the loading and unloading functions of the emergency cut-off valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0020] In the figure: 1, ratchet wrench; 2, handwheel; 3, packing seal for the lever; 4, lever; 5, stop valve stem; 6, packing seal for the stop valve stem; 7, stop valve flap; 8, sealing gasket; 9, lever shaft; 10, inner lever; 11, cut-off valve stem; 12, cut-off valve flap; 13, compression spring; 14, valve cover. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0022] Please refer to Figure 1 , the present invention provides a technical solution: an emergency cut-off valve for a mobile pressure vessel, including a valve body. A lever 4 is provided at the upper end of the valve body. A handwheel 2 is provided outside the lever 4. The upper end of the ratchet wrench 1 is connected to the ratchet wrench 1. A stop valve stem 5 is installed inside the valve body. The stop valve stem 5 is of a hollow structure. The lever 4 is threadedly connected to the stop valve stem 5. A sealing gasket 8 is provided in the middle of the valve body. A stop valve flap 7 is provided inside the sealing gasket 8. A lever shaft 9 and an inner lever 10 are provided on one side wall surface inside the valve body. A valve cover 14 is installed at the bottom of the valve body. A compression spring 13 is connected to the inner wall surface of the valve cover 14. The upper end of the compression spring 13 is connected to a cut-off valve flap 12. The upper end of the cut-off valve flap 12 is connected to a cut-off valve stem 11.

[0023] In this embodiment, a packing seal 3 is further provided between the handwheel 2 and the pressure rod 4, and a globe valve stem packing seal 6 is provided between the globe valve stem 5 and the valve body.

[0024] In this embodiment, the upper end of the shut-off valve stem 11 is in contact with the inner lever 10.

[0025] The detailed connection means are well-known techniques in the art. The following mainly introduces the working principle and process, and the specific work is as follows.

[0026] Embodiment:

[0027] Operation steps when the hydraulic pressure opens the cut-off valve flap 12: The seal of the cut-off valve flap 12 is completed by the pressure of the compression spring 13; the top force of the hydraulic cylinder is used to push the outer lever to rotate the coaxially connected inner lever 9; the arc surface of the lever presses on the spherical surface of the cut-off valve stem 11 and slides to press open the sealing valve flap until the cut-off valve flap 12 is opened; the opening height of the sealing surface is 8-13 mm. At this time, the globe valve handwheel 2 is rotated to lift the globe valve flap 7, and the charging and discharging of the medium are started.

[0028] This device is used for the emergency cut-off valve on the mobile pressure vessel box. It is the inlet and outlet for filling and discharging the medium of the tank container, and is a safety accessory for class III mobile pressure vessels, subject to national TS-certification standards approval and supervision.

[0029] The hand-operated power pressure rod linkage mechanism uses the globe valve stem 5 as the base shaft. The base globe valve stem 5 is designed as a hollow shaft, with an inner and outer threaded valve stem 4. Its outer thread is the globe valve stem 5, and the inner thread is the threaded connection channel of the pressure rod 4. The globe valve stem 5 and the globe valve flap 7 form an opening and closing mechanism. There is a channel opening of the pressure rod 4 at the bottom of the globe valve flap 7 and a sealing gasket 8 is filled. The top end of the pressure rod 4 presses the sealing gasket tightly with the thread force, forming a sealing point and a double seal of the pressure rod with the packing seal 3 of the pressure rod. When the globe valve opens and closes, the pressure rod 4 presses the sealing gasket 8 and remains stationary in the sealed state, following the globe valve passively.

[0030] Operation steps of the hand-operated power pressure rod linkage:

[0031] Step 1: Rotate the handwheel 2 to close the globe valve flap;

[0032] Step 2: Rotate the ratchet handwheel 1 to break through the sealing gasket 8

[0033] Step 3: Continue to rotate the ratchet handle 1. When the pressure rod 4 descends and presses on the inner lever 10, force needs to be applied to press down the ratchet handle 1. When it feels strenuous again and a burst flow sound is heard, the cut-off valve has been opened;

[0034] Step 4: After the unloading is completed, the ratchet wrench 1 is rotated back, and the pressure rod returns to its original position and the cut-off valve closes automatically. Step 5: Return to the factory for major repair, install the sealing gasket 8, and reuse.

[0035] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

Claims

1. An emergency cut-off valve for a mobile pressure vessel, comprising a valve body, characterized in that, A pressure rod (4) is provided at the upper end of the valve body. A handwheel (2) is provided outside the pressure rod (4). The upper end of the ratchet wrench (1) is connected to the ratchet wrench (1). A globe valve stem (5) is installed in the valve body. The globe valve stem (5) is of a hollow structure. The pressure rod (4) is threadedly connected to the globe valve stem (5). A sealing gasket (8) is provided in the middle of the valve body. A globe valve disc (7) is provided inside the sealing gasket (8). A lever shaft (9) and an inner lever (10) are provided on one side wall surface inside the valve body. A valve cover (14) is installed at the bottom of the valve body. A compression spring (13) is connected to the inner wall surface of the valve cover (14). The upper end of the compression spring (13) is connected to a cut-off valve disc (12). The upper end of the cut-off valve disc (12) is connected to a cut-off valve stem (11).

2. The emergency cut-off valve for a mobile pressure vessel according to claim 1, characterized in that, A pressure rod packing seal (3) is provided between the handwheel (2) and the pressure rod (4). A globe valve stem packing seal (6) is provided between the globe valve stem (5) and the valve body.

3. The emergency cut-off valve for a mobile pressure vessel according to claim 1, characterized in that, The upper end of the cut-off valve stem (11) is in contact with the inner lever (10).

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